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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0928b8b74bf3db0b9a076bbe8fc9f8b7e8389fe01d9fcd558e57ad7d1729c9' 
  AND token = 'Jf5Mmppf7l4B+C5W/PkoyMVY/ZyrAJ9renR0ZjkKzTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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