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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '779826a56491a891f005928b2dc404b309ea02c1115dd136251a7f606042d838' 
  AND token = 'qJJyfnCHRD6yNJ7QRQI7VYNvi3UEMeQ6bFG7yhreYZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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