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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c314ca3b61f6094c600cf8499630db439d8e2ba52aa317423e75fb5eb36631b0' 
  AND token = 'gUnEInozl71M5skmYfeA2TrkTEHevJ9mLNCREhL+QB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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