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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f959dda4e259a4a6882b8185d554d9c478c057ee5c6b61c0d437d6f4acee0c' 
  AND token = '9Vmx9E5fu6Wde3faXc+vdcB/4aPKaod7yC8xYQ6Kfjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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