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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515089e79d1907c52a4324429d11d7cb66f9d48b3a695ed01f9619146d84d285' 
  AND token = 'PjCV8S4AonPDx6BUD76YpHMZzfmUZptwS4RjcGCe2X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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