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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27b1f587ad0480e461ebd8a97659ab49de939cbbb1abacc5778696b51fdd5b4' 
  AND token = 'yeheT9mv+CGbqK3ZrXtnuY3T/Qh02tvUpQJ173jjors=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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