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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c29df67dae2082bf0ff70344e863e087b8dad46fb8b1f0313cda1789d23a85' 
  AND token = 'F18u4Hc+3QwKueaAYL4TzHUhskM+psQgacEytXF8t30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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