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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9bb617b4192dcb62304e8e43e18ccd4fbc8982e8a32133ff6abd79c9130ece' 
  AND token = '/l8ZxQy58WAuJQuoP0vkeOzDXJCCFi6Tm8pANAEsfkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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