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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b2692d4d9c34653612625daccbb001a05361d46961eaf8058a13f8320fc09b' 
  AND token = '59lbvMEP80J97xBIxE74WQAZ3a2lC7ekpTl9TuDDkh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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