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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c033f0800280984e3d6f7b0258a478ccbf8673b688ea48b81d0897667abba1b0' 
  AND token = 'uRmh8OJe95jN6yBd6kNINIoH9drl6urbcEIKPRs7npM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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