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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd303d84eb6fdfbe4d2d7185a52b70a9f4740aff16f9bcb6777b5765c27468e' 
  AND token = 'sBbnWZ2X7ez3zpkmhjZzIVbSw5/FjQmZrHNe/mjAjN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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