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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e51e047190c469b04484c87c0b382dee41398481c66bf096d9772418e32c95' 
  AND token = 'HwYM0sCN8sirG76G2rQ8xMb9IJLOXxrGhWmKEBE5OO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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