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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d488f53631000135e157c8fbec8cceb2e793728ec0f4fe07fdf19f46ab38926' 
  AND token = 'vZfDaIvS5IJEalQaIpn97X4CgDMUaX3BAm/54CXEHV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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