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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c660f5ff3fd9be05a96f426cb6803ef57625f2008a0d2e1305e6b84b1677d4df' 
  AND token = '1gPPZ9P1lg4VZTs0nMravJIaHzPRn3E9FIJR80JwuNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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