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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83854a43ca4732701ac97cf321a529cef62105c80e6b1613e4828c1c0dfce8e0' 
  AND token = 'm2U4ig+gtyP1PmQsBJVI5ircCdVSTtlrWzt3X4XDCaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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