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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7862dc9facbd101032c822f6c4b521fbf514dfd3a1cd44e15017ead12f18d67a' 
  AND token = 'A8euBZWnS+Yb6nx0hCW09+z+Y1IHBP5yjnf3ifDUUKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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