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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639e80766a1393439209aaedc6b84827299f0f8862e191a0dfff3ae65a935e08' 
  AND token = 'E5OdNsTb8RgQsKF7f0EkaO4GKgyCmsHuuMjjW/M2k+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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