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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a30ec07b145c8b3b979db0e4de025c2c363d04bee61bc60752d3c52d5099ded' 
  AND token = 'gVCC2bsUP7j3zWdevrwzrT0lJV+51PevZYdFxg4X9rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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