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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c156cc3187d8cdb3065381602d64e7a8d01bdb022f012e35c76508cfd283e5' 
  AND token = 'nexpT63wmWmQvyw83V+y5UcZ3mlE9lUMf+RnJwU8t54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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