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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3cbe6b7d1951b86322352919c4c17d6842b037a59b9b1c68f8da477bb55fb1' 
  AND token = 'Ufo0QmFtfNUlMcGPE/VqEqIbwurQL3J6psZwQNklJEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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