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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fba32d3305e93ad3e4eff6333e4748b9790b1c6cd5ecc28e86c8d3ce7403e31' 
  AND token = 'EljQTvjM8hizYNjl9cH5FRWBjHcGJdH2SQPd0wEXrdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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