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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78040513afaf4992a75ca32c9a6208a061275d11dff25ae1edc5bee512476e01' 
  AND token = 'a+0oY5KejMzhCz8a4UNrgOhsImxshuBhl0Uu/jPyaw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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