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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9cc84b85cb62b0464e1f9c58b341593f3a82b8539ad2455c4aa22197d70407' 
  AND token = 'KS6HFyNPWt6viiiHAf60fTjWPKdABu55Z9dAmkOJfkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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