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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa0c8adc0c683a785eca52fb8a4d1eec4a0d97b68532d4df48b8ddf9d5cee88' 
  AND token = '+nbEB0D7td29A7TwOAAO27n9ivE2tYVnEo/ltUaXrxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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