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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cce92a2cc725caade6f50904822fdefc013ff669b6c6330fcabcc58f0811a5' 
  AND token = '9T4TqyZC1m+huD2230paijAfOmHBDEe8MjImh0fLheA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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