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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ed71514d727807cd55150109210ad12acd317ad164039b309732e0d56fd288' 
  AND token = 'xAK7k0mhhEW3P5w85bbjxlp6UAs3E1BW/SPW5d1V06w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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