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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a2793768a8b652ef6290f7914993de954d95d0e40a9e1a552478793b57b277' 
  AND token = 'FD82PSWy2K2tHrKGb55Y5EBbyL41+paMJLoN6Qh6pWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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