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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b60e0fc88ad45330640a7c0694db10587aa4190ae9a7e6db7ea40de9314c4c' 
  AND token = 'cYtqVqL3VzicZW5893vl4MotR2k3j4gHVqHDJll8dlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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