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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07c00b981b6a7d260da68c6d1975e65ee555e6290d16a6c3ce939375176badb' 
  AND token = '1vmP+/vYHS/pSZip1piPQpA6wKtiOeA62C8yS5cVleE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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