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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557d79e580c4286419ad2de3955cdf900fd33422dec3888aa2077bb9bc6c0c3a' 
  AND token = '6sZlMq8FpQ4eQft8S7sdyBKuu9GTMSSFhp7g4RUiFZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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