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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acac9789df8ac18bc26c7729ba1876de92e84cade7a4c061b38ccc5b823d8b52' 
  AND token = 'jOkB78f4hqoInOzo22qzeD/Vj6aKEXLPEBZdb01acyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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