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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe5c9f0dd7c1cc57f365937536b6cb4a4d7f74c8b45e7e86b2f013bd909201d' 
  AND token = 'LNILzNmte7ZnjWHHfM9HxC9DMvGN4i0D78/izWnoqkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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