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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91767ef452d3d1deac5c6f14d56d6db78887d9c54d15ef427115b0eba5ff0da6' 
  AND token = 'kx4Ni8l6A+wD00dy43GDx3itBgAxbII2SkSiY5I1svQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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