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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb0caaf327e2bbf215553db1aa5f7f78b8a0226408d2c46c9c64dd8d1ac782c' 
  AND token = 'dusvmOfGIHxTvhhqkI1dlONvnOeqccr/lse5GCGoJtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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