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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91dae162185926f2011fe8033a78949a82a976d1008b5baef8f5c15eeca3594' 
  AND token = 'pIWsEH40drXWU/93VwQAcw7iFS3lDGMS9QD+xAgTXEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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