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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd839ff886bd7a0c7433b0b697987885a17a78dce9c904ed00e9867fe04bf0391' 
  AND token = 'mZ2pcLFjXgBfW4FaCLQiTknBAkz/H2Bwg/H1R1MI0+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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