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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d38459d14d76596bd20a5f7e6a1d223e062c0bbb94e7bc2dfaac87fe3135aa' 
  AND token = 'CyXMvZ9xyI8s8cQK5op73jOX3JSon12lDx0turMsiiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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