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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28fca194a18e9ebdb9839d9112c54d9dc201f39bcf71035db92886cf306a40fb' 
  AND token = 'StYg0rcLioFimoVQY0bGw1/Mu0kHKiGNgVJW9PIcJlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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