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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2077400636cca7697d86bf5ca2ba49618f9aec912e45abfeba6fb3a17ce7ed71' 
  AND token = 'iBedSivS+IANC8/PM4mj1PtjaM3m6u8xt9oIWg/6W1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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