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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7668d09502e52e11f50156d432a797b9bfbd2350dc2c2b5cbdd1beb45e2c7505' 
  AND token = '2nT4Or2x4dhNKm+ClfvSKiaWTqZtEgYEdiKw0xW1+fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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