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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0256c13ea15f5e6ca3bb90b9667ae9b3bfa17480efdfefda46aeea7da776f3a' 
  AND token = 'haKjNayfdYwR8J/Kzsk9xFeRIb6/QZM7sqW94UvrIfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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