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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7df33c1c3eadfd3c17cd2b3cc38e4212ba1d8e1e94910aeb651b8e86cc9ca3' 
  AND token = 'Jl0vjWMNr6eCG3RVas2IRcJp8Cntq1aEVYyFa884H90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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