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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd79a6b18e39a3429b87911914123a912ad541d9cd67711fc7464ebc6ab102d' 
  AND token = 'en/W/vypk9qmxTigeXZEW3Vz1aIy6E2KuomDdq3ArOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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