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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f97f5ff606c3f998923834d4f46af875d44ae3c2e55f81b84337c791a6a161' 
  AND token = 'KANEXLK9dAUTR2kP4pcW/zC6O8V5Zc+Q7DSF4/chiJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}