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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69fe60adec736c131ddbe1d94e6ecd1eadc6d8778e923588cb1ee156ec52b41b' 
  AND token = 'jNw7n61ViQZahFL8CcXj0NAjiFof9SrwGB0laKDG7co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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