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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5a8649264605f8b21b054e52a75451e2558f4a5425ca0f984cae6062eca2d4' 
  AND token = 'g3n1vLAPgr1D0mjvZ25VldRsCZWpoXw7Og1ice8zze8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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