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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efbdc4a90673952e25dffe550d3b5fe3314d735681452fcf08feba3a4477a88e' 
  AND token = '5Fy0RI6ZxmmAQEnypUg/bok/3KM+3PiVXStNSQFklXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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