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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba7d6ce93752b0d133e1691ea350de86d4789d3a996fcde47a388883e69cee9' 
  AND token = 'oAETbgwV1wPKu26VgJrWV1VaFIHBqfO7+5jPE3Hc3Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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