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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62751f7f10e60ba2c00cc7c89475cfc1e437813e39ed48be41a95c1e55f1808a' 
  AND token = 'jUFi4xEczp3jNpbjhMiB+cpH3xL7u4TWeQV6IQlWpa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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