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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29ea5f33cb1db70da9edc6e3627a387a3a4e0941a2ddc23427246d467ac502b' 
  AND token = '3VaSFGToe6B6KBy2KfF3tmPvekJDrBdOcFxkEcqVYXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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