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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85f5161370f00da042fee7bc81c9da75467aae245776f706f6c878e44539d57' 
  AND token = '69Ny2di6D+KCuudwZ3ORj6bJ95wa5wfzTQmAuW1HmKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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