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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284dc1af6f6e0578a4ac4c2092e4e05cb31e4cbb8c481f721f548dac8a81ae64' 
  AND token = '5VD3UknintDAhpg1xiKNmuZWo4JkmKoTuS/q4khHtfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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