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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a2086f4485674bb0ab8c85b26d920df7e9f676e7c8aed55a8a9b871dba9af2' 
  AND token = 'zND8oBbBN0KOxQvYXZEWdw4RKCD7+QdfQOH8qLKSGSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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