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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb72dd15c8596c3674fc6de7e87f9885ec9593752ada7b54a5dab838f0a08407' 
  AND token = 'iXPSvUBjpKvFAA1DbiQOFtPzq+SsU9x+TzX8HbHQS14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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