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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85b3bee5bee37d7b1c8b7cc363a80c32e4e866a3515dde13dde60eb379e398d' 
  AND token = 'SvSLqROegmyKLrIb8NUVo2zf0a4Pws8pj2Xpftm196I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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