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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58d8be5c0d4508973c33ee2ef82b3f5b93d06010eb08426617bc0df60f87c7e' 
  AND token = 'j5stq2z2r7yfYf7XxPu19OaD8v934jXH/wYWEhFr4kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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