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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513dd9a92b1c6a298d2af42d4d94bc0a5d019f06003f4dfb1c52471daaa8c7aa' 
  AND token = 'XvKbsLBQw4yaEkFnCgIIhz4NlSz43HsyShCgA2xzO3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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