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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392519743c7c9b956f45d19905b3e41309893fc32f33af6c6693d859c237fa11' 
  AND token = '5mimrBRm7Fh2WWG4Ata8F/OVHFe0B3Zq79aUHKEJ/Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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