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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88063c25f50f34bb97a20493420d926dd9463ee5bed7b4474c81d3a6ceabeb99' 
  AND token = '/hhHW8wjaC79HvX2KkHHfZDtK5LSi0mckY/sUZJNiOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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