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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce24c4293df7449a58749eca2f4759cfbfbf1a3aecdf7b3fa3ad92c67a5f33f2' 
  AND token = '8c6h3y1u6Bqm1oBhlKAy6E3H5s9DEw8rNp5KDIg5zpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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