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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e1323cb75268e60367e3b1f6629dccdb1995d47c595614ada398795a7f0c9d' 
  AND token = 'myrZRZ0xVmHXXJbeK7LmgFrf4QG7Tf9c9A7bVgsUm2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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