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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f09fc592d0c9070ef3fa8713f2fe88507e179910ceaa078bbfeda250ac7e623' 
  AND token = 'J3hHjKrW8ZLnJ/bSv2TjWvUgoeKQamRKck0tbCCizhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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